Volume 55 (2023)
Volume 54 (2022)
Volume 53 (2021)
Volume 52 (2020)
Volume 51 (2019)
Volume 50 (2018)
Volume 49 (2017)
Volume 48 (2016)
Volume 47 (2016)
Volume 46 (2015)
Volume 45 (2014)
Volume 44 (2013)
Volume 43 (2009)
Volume 42 (2008)
ارتقای کیفیت دسته‌بندی متون با استفاده از کمیته‌ دسته‌بند دو سطحی

Sa'eed Jalili; Ali Akbar Sadri

Volume 41, Issue 5 , December 2007, Pages 597-614

https://doi.org/10.22059/jac.2013.7873

Abstract
  Nowadays, the automated text classification has witnessed special importance due to the increasing availability of documents in digital form and ensuing need to organize them. Although this problem is in the Information Retrieval (IR) field, the dominant approach is based on machine learning techniques. ...  Read More

اندازه‌گیری دقیق ولتاژ الکتریکی در مبدل ولتاژ نوری با استفاده از شبکه‌های عصبی

Hassan Monsef; Taher Ghomian

Volume 41, Issue 5 , December 2007, Pages 643-651

https://doi.org/10.22059/jac.2013.7876

Abstract
  This paper introduces Artificial Neural Network (ANN) method for measuring voltage in the Optical Voltage Transducer (OVT) using one or more electric field sensors. In order to obtain an accurate voltage measurement with minimum number of sensors, first the locations of sensors are specified by quadrature ...  Read More

تعیین حد پائین واریانس خطای تخمین برای زاویه سیگنال دریافتی با استفاده از روش CRB در آنتن های آرایه ای

Hamid Reza Bakhshi; Azar Mahmoud Zadeh

Volume 41, Issue 5 , December 2007, Pages 577-586

https://doi.org/10.22059/jac.2013.7878

Abstract
  One of the important issues in many of array systems such as Radar, Sonar, Mobile, and satellite telecommunications is the estimation of DOA of narrowband received signal. CRB is very important in evaluation of parameter estimation. CRB is the lower bound estimation error variance for any unbiased estimation. ...  Read More

ریز ماشینکاری PET با استفاده از لایه برداری شیمیایی در حضور

Nima Izadi; Amir Samak; Shamsoddin Mohajerzadeh

Volume 41, Issue 5 , December 2007, Pages 567-576

https://doi.org/10.22059/jac.2013.7879

Abstract
  In this paper, we report vertical etching of poly-ethylene-terephtalate plastic substrates by means of a chemical solvent and in the presence of ultra-violet illumination. Since the PET substrate is not dissolved in solvent without a UV source, only the desired areas with proper opening for UV exposure ...  Read More

بررسی اثر تزویج متقابل بر مشخصات تشعشعی یک آرایه آنتن مسطح محدود شامل پچ های مستطیلی

Fa'egheh Amirzadeh; Mahmoud Kamare'i; Gholamreza Dadashzadeh

Volume 41, Issue 5 , December 2007, Pages 557-566

https://doi.org/10.22059/jac.2013.7880

Abstract
  In this paper a novel method for computing the radiation pattern and also the input impedance of a planar rectangular micro-strip antenna array with consideration of mutual coupling and mutual impedance is presented. Each two triangles with a common edge make an Edge element or RWG. Any such edge element ...  Read More

روشی مبتنی بر تئوری گراف جهت تعیین بهینه جزیره ها در فرآیند بازیابی

Hossein Afrakhteh; Mahmoud Reza Haghifam

Volume 41, Issue 5 , December 2007, Pages 541-555

https://doi.org/10.22059/jac.2013.7881

Abstract
  In this paper, effect of the islands number variation in restoration process is investigated and a graph based method for determination of optimum islands boundaries is presented. Also, the effect of number and location of black-start units on the restoration process is evaluated. In optimization process, ...  Read More

معرفی و شبیه سازی روش جدید اندازه گیری ضریب تلفات عایقی و پرمتیویته نسبی

Hassan Abravesh

Volume 41, Issue 5 , December 2007, Pages 535-540

https://doi.org/10.22059/jac.2013.7882

Abstract
  For evaluating quality of electrical insulation, it is necessary to measure the property of insulators. Dielectric constant and loss tangent (tans) are two important parameters for determining the property of insulator. The measurement of above parameters is normally based on the time- domain and frequency-domain, ...  Read More

تحلیل و طراحی تغییر دهنده فاز N - بیتی MEMS توزیع شده در باند Ka

Habibollah Zolfkhani; Jalil Rashed Mohassel; Farrokh Hojjat Kashani

Volume 41, Issue 5 , December 2007, Pages 623-630

https://doi.org/10.22059/jac.2013.7883

Abstract
  Modern microwave and millimeter wave phased array antennas are attractive because of their ability to steer wave beams in space without physically moving the antenna element. A typical phased array antenna may have several thousand elements fed by a phase shifter for every antenna, which can steer the ...  Read More

ارزیابی قابلیت اطمینان تولید در بازار برق رقابتی کامل

Hossein Harounabadi; Mahmoud Reza Haghifam; Mahmoud Fotouhi Firouzabad

Volume 41, Issue 5 , December 2007, Pages 653-662

https://doi.org/10.22059/jac.2013.7884

Abstract
  Deregulation policy has caused some changes in the concepts of power system reliability assessment. This paper deals with generation reliability evaluation in perfect competition power market using market economic concepts and its dynamic. Also, because of power markets and generators’ forced outages ...  Read More